GNG, 1000W 48V BB-drive, $400

spinningmagnets said:
I "think" the whole "parallel first, then connect the parallel strings in series to get final voltage" was to make balance charging easier. A 12S 44V group can be split into to two strings and charged with two 6S chargers. If you bulk charge the entire pack with a 44V charger all the time, then I "think" you can parallel or series in any order that's convenient.

I am willing to be convinced otherwise by anyone with a persuasive opinion.
Click to expand...

You are right, the only reason for the "parallel first" is for charging purposes. The way i have my lipo's deployed, parallel first would be a wire nightmare on my bike, so I also parallel them at the end only and end up removing all of them to charge them in parallel. I guess it depends how you deploy the batteries on your bike.

Wishes
 
Once upon a time over six years ago when using SLA I hooked three bricks together in series for 36 volts. Then I ran up to four of these 36V packs in parallel to power my 3 motor delta trike and pusher trailer. The "Sparkys" told me then that this was the wrong order, that the batteries should first be paralleled to gain the amp hours and then hooked up in series to gain the voltage. I never made the change and it all worked fine. I also bulk charged the whole works with a single 36V charger.

I think their main point was risk to the total battery pack. Let's say one of the 12 volt bricks went to 0 volts due to internal issues. In my arrangement described above all the other 36V packs hooked in parallel would try to keep charging the now defunct 24V pack, and I don't know what might happen, maybe bad sparks, since lots of 36V juice would be directed at the 24V pack.

If hooked up the way the "Sparkys" recommended, then just the three bricks in parallel with the defunct brick would be drawn down to 0 volts, but no batteries would be in an overcharged position. So the total pack would be down to 24V, but the other 8 individual bricks would still be properly charged.

These issues are probably more apt to cause bad problems with the more sensitive chemistries we all use now. I've paralleled two Pings together many times, but they are always separated for charging and only paralleled again when fully charged and sitting at very close voltages. Also, never run to LVC when in parallel.
 
I'm really good with neat and simple. Wiring that is an incomprehensible rat's nest just makes me angry. Since I bought a wimpy 6S charger and will be taking my packs apart for charging in the short term, I'm going to treat myself and take the low road on wiring my pack. Parallel second it is. I feel better already. :D
 
LightningRods said:
I'm really good with neat and simple. Wiring that is an incomprehensible rat's nest just makes me angry. Since I bought a wimpy 6S charger and will be taking my packs apart for charging in the short term, I'm going to treat myself and take the low road on wiring my pack. Parallel second it is. I feel better already. :D
Click to expand...
Yep, simple is better even if there may be drawbacks , I've been beating on my batteries for quite a while now, if I had to replace them in the next couple months I'd still be satisfied with my setup in cost verses use , but I think they will live quite a bit longer ( years perhaps? )since they show no sign of slowing down.
 
LightningRods said:
I have had no luck at all with this particular vendor, "lindachangshihang". When I try to order from 'her' I get notices about "is forbidden sell item termed "gear"". What in the hell ever that means.
Click to expand...

LightningRods, did you get that notice when trying to order directly from lindachangshihang or through Mr Tao?
What vendor is recommended for ordering the motor?

Regarding the serial/parallel configurations:
Most Lipo packs/bricks are composed of individual cells connected is series.
When a pack is connected in parallel to another pack (both the power wires and the balance wires), each individual cell in the pack is connected in parallel to a cell in the other pack. Cells connected in parallel have a tendency to balance each other, as opposed to cells connected in series.

This tendency comes into effect mostly when charging. Charging 2 pack in parallel will require less balancing work from the charger compared with a serial configuration, so charging will potentially take less time.

Also, charging 2 or more packs in parallel will typically take less time in total compared with charging each pack individually.

To sum things up, the main benefits in parallel wiring are in charging and in order to reap them the balance wires must be connected in parallel (typically with a "Y" harness), not just the power wires.

I hope this clarified things a bit, if anyone wants more info on this subject, I will be happy to try and spread some 'Sparky' knowledge around in what I hope is plain English.

Since my 'Sparky' knowledge was acquired in the RC field, I'd like to get some e-bike input regarding which aftermarket controller is recommended for the GNG motor? I am planning to reverse the rotation and use a Cycle Analyst, if it makes a difference.

Avner.
 
Denisesewa said:
LightningRods said:
I'm really good with neat and simple. Wiring that is an incomprehensible rat's nest just makes me angry. Since I bought a wimpy 6S charger and will be taking my packs apart for charging in the short term, I'm going to treat myself and take the low road on wiring my pack. Parallel second it is. I feel better already. :D
Click to expand...
Yep, simple is better even if there may be drawbacks , I've been beating on my batteries for quite a while now, if I had to replace them in the next couple months I'd still be satisfied with my setup in cost verses use , but I think they will live quite a bit longer ( years perhaps? )since they show no sign of slowing down.
Click to expand...

I wish I was getting similar performance from my Zippy LiFePO4. At 1000W they were very happy. 1500W... not so much. <50 charge cycles is unsatisfactory.

Eh... been looking at a bunch of different pre-made LiFePO4 packs. The weight to capacity difference is just crazy. :(
 
ferret said:
LightningRods, did you get that notice when trying to order directly from lindachangshihang or through Mr Tao?
What vendor is recommended for ordering the motor?

which aftermarket controller is recommended for the GNG motor? I am planning to reverse the rotation and use a Cycle Analyst, if it makes a difference.
Click to expand...

I tried ordering from lindachangshihang through Mr Tao. The only contact information I could get for that vendor was a web based e-mail address (like g-mail). They didn't respond to my direct inquiries.

I found a tricycle company in Shanghai that will sell me the motors but only in lots of 20 or more. They wanted 100 but I told them 20 was the best I could do. If people want motors I can get them. The main benefit is shipping. I'm paying the same price that you see on TaoBao but getting a much better shipping rate on a palette of 20 slow boating across the Pacific. Most TaoBao shipping on heavy items like these approx 7 lb motors equals or exceeds the cost of the goods. Sadly if you are not in the US shipping a second time will probably wipe out the savings. I do plan to offer motors with machined spindles and potentially other upgrades like heavier gauge phase wires and built in thermostats. PM me if you're interested in getting one of these motors. If you go in on the purchase I'll cut you in at the price I pay.

I want to make it clear that calling my technical betters "Sparkys" is pure envy. :mrgreen: I would love to know what you know.
 
SolarRay said:
Vendor: 尤奈特
Motor: bm 1418* (but it is twice as wide stator)
Click to expand...

"Your search - 尤奈特 - was automatically translated to "Mr Knight" - and did not match any products."

I have seen motors that are virtually identical to the 'GNG' model but much wider in case and armature. A customer of mine in Portugal ordered off of TaoBao thinking he was getting a GNG motor and got a beast about 50% wider. The end cases and even the type of cooling fins in the center case look identical.
 
LightningRods said:
"Your search - 尤奈特 - was automatically translated to "Mr Knight" - and did not match any products."
Click to expand...
Big Brother is not true corrects you. ;)
You can use these links:
http://www.unitemotor.com/
http://s.taobao.com/search?q=bm1418
"http://s.taobao.com/search?q=尤奈特"


bzhwindtalker said:
Awesome! I need one of those wider motors!
Click to expand...
There is even wider: bm1412*/bm1424*.
But then you need a wider bb.
 
Do you think i can put a GNG in my new creation?
It's now designed for a hub, but maybe it will fit
 

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Just design it with a 73mm bottom bracket shell & your good to go.
 
Thud said:
Just design it with a 73mm bottom bracket shell & your good to go.
Click to expand...

Yes it is. Total wide inside is 120mm
Bb is 73mm . Material is 2,4mm alu 7005
 
Hello Sphere, I need your help once again.


I am having great challenges with my kit, first had to cut the bottom GNG bracket to fit my 73mm BB, with the axle and sprockets of the GNG doing the hula, I ate up a chain in the first 500 yards, So, I ordered a cyclone BB & triple chain ring ( has yet to go on ) My LIGHTNING RODS SHEETS are in flight to So. Cal. as we speak.


Bought a new thumb throttle as the wire came out of my stock one, went to solder it back, and it fell off........, through it in the trash.


So, I have my new throttle and I wire it up and No Power, I need your help to try and figure out what is happening.

Thanks
DSCN2471.JPG
DSCN2469.JPG
 
You need the
Red
Black
White

Wires.
For throttle function
 
have u checked the connections in the yellow connector ? some times they look fine but one of the wires dont connect properly,,

it may be a faulty throttle,


im sure some one on here will help you to get the motor running without the throttle, then you will know if its the throttle or something else
 
Kingwouldbe said:
what do I connect the brown & yellow wire too
Click to expand...
Nothing unless you have a on/off switch.
 
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